
/******************************************************************************
  * @attention
  *
  * COPYRIGHT 2016 STMicroelectronics, all rights reserved
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
  * AND SPECIFICALLY DISCLAIMING THE IMPLIED WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
******************************************************************************/


/*
 *      PROJECT:   ST25R3916 firmware
 *      Revision: 
 *      LANGUAGE:  ISO C99
 */

/*! \file
 *
 *  \author Gustavo Patricio
 *
 *  \brief Implementation of ST25R3916 communication
 *
 */

/*
******************************************************************************
* INCLUDES
******************************************************************************
*/

#include "st25r3916.h"
#include "st25r3916_com.h"
#include "st25r3916_led.h"
#include "rfal_platform.h"
#include "rfal_utils.h"


/*
******************************************************************************
* LOCAL DEFINES
******************************************************************************
*/

#define ST25R3916_OPTIMIZE              true                           /*!< Optimization switch: false always write value to register      */
#define ST25R3916_I2C_ADDR              (0xA0U >> 1)                   /*!< ST25R3916's default I2C address                                */
#define ST25R3916_REG_LEN               1U                             /*!< Byte length of a ST25R3916 register                            */
#define ST25R3916_MOSI_IDLE             (0x00)                         /*!< ST25R3916 MOSI IDLE state                                      */

#define ST25R3916_WRITE_MODE            (0U << 6)                      /*!< ST25R3916 Operation Mode: Write                                */
#define ST25R3916_READ_MODE             (1U << 6)                      /*!< ST25R3916 Operation Mode: Read                                 */
#define ST25R3916_CMD_MODE              (3U << 6)                      /*!< ST25R3916 Operation Mode: Direct Command                       */
#define ST25R3916_FIFO_LOAD             (0x80U)                        /*!< ST25R3916 Operation Mode: FIFO Load                            */
#define ST25R3916_FIFO_READ             (0x9FU)                        /*!< ST25R3916 Operation Mode: FIFO Read                            */
#define ST25R3916_PT_A_CONFIG_LOAD      (0xA0U)                        /*!< ST25R3916 Operation Mode: Passive Target Memory A-Config Load  */
#define ST25R3916_PT_F_CONFIG_LOAD      (0xA8U)                        /*!< ST25R3916 Operation Mode: Passive Target Memory F-Config Load  */
#define ST25R3916_PT_TSN_DATA_LOAD      (0xACU)                        /*!< ST25R3916 Operation Mode: Passive Target Memory TSN Load       */
#define ST25R3916_PT_MEM_READ           (0xBFU)                        /*!< ST25R3916 Operation Mode: Passive Target Memory Read           */

#define ST25R3916_CMD_LEN               (1U)                           /*!< ST25R3916 CMD length                                           */
#define ST25R3916_BUF_LEN               (ST25R3916_CMD_LEN+ST25R3916_FIFO_DEPTH) /*!< ST25R3916 communication buffer: CMD + FIFO length    */

/*
******************************************************************************
* MACROS
******************************************************************************
*/
#ifdef RFAL_USE_I2C
#define st25r3916I2CStart()               platformI2CStart()           /*!< ST25R3916 HAL I2C driver macro to start a I2C transfer         */
#define st25r3916I2CStop()                platformI2CStop()            /*!< ST25R3916 HAL I2C driver macro to stop a I2C transfer          */
#define st25r3916I2CRepeatStart()         platformI2CRepeatStart()     /*!< ST25R3916 HAL I2C driver macro to repeat Start                 */
#define st25r3916I2CSlaveAddrWR( sA )     platformI2CSlaveAddrWR( sA ) /*!< ST25R3916 HAL I2C driver macro to repeat Start                 */
#define st25r3916I2CSlaveAddrRD( sA )     platformI2CSlaveAddrRD( sA ) /*!< ST25R3916 HAL I2C driver macro to repeat Start                 */
#endif /* RFAL_USE_I2C */


#if defined(ST25R_COM_SINGLETXRX) && !defined(RFAL_USE_I2C)
static uint8_t  comBuf[ST25R3916_BUF_LEN];                             /*!< ST25R3916 communication buffer                                 */
static uint16_t comBufIt;                                              /*!< ST25R3916 communication buffer iterator                        */
#endif /* ST25R_COM_SINGLETXRX */
    
/*
 ******************************************************************************
 * LOCAL FUNCTION PROTOTYPES
 ******************************************************************************
 */

/*!
 ******************************************************************************
 * \brief ST25R3916 communication Start
 * 
 * This method performs the required actions to start communications with 
 * ST25R3916, either by SPI or I2C 
 ******************************************************************************
 */
static void st25r3916comStart( void );

/*!
 ******************************************************************************
 * \brief ST25R3916 communication Stop
 * 
 * This method performs the required actions to terminate communications with 
 * ST25R3916, either by SPI or I2C 
 ******************************************************************************
 */
static void st25r3916comStop( void );

/*!
 ******************************************************************************
 * \brief ST25R3916 communication Repeat Start
 * 
 * This method performs the required actions to repeat start a transmission
 * with ST25R3916, either by SPI or I2C 
 ******************************************************************************
 */
#ifdef RFAL_USE_I2C
static void st25r3916comRepeatStart( void );
#else
#define st25r3916comRepeatStart()   
#endif /* RFAL_USE_I2C */

/*!
 ******************************************************************************
 * \brief ST25R3916 communication Tx
 * 
 * This method performs the required actions to transmit the given buffer
 * to ST25R3916, either by SPI or I2C
 * 
 * \param[in]  txBuf : the buffer to transmit
 * \param[in]  txLen : the length of the buffer to transmit
 * \param[in]  last   : true if last data to be transmitted
 * \param[in]  txOnly : true no reception is to be performed
 *  
 ******************************************************************************
 */
static void st25r3916comTx( const uint8_t* txBuf, uint16_t txLen, bool last, bool txOnly );


/*!
 ******************************************************************************
 * \brief ST25R3916 communication Rx
 * 
 * This method performs the required actions to receive from ST25R3916 the given 
 * amount of bytes, either by SPI or I2C
 * 
 * \param[out]  rxBuf : the buffer place the received bytes
 * \param[in]   rxLen : the length to receive
 *  
 ******************************************************************************
 */
static void st25r3916comRx( uint8_t* rxBuf, uint16_t rxLen );

/*!
 ******************************************************************************
 * \brief ST25R3916 communication Tx Byte
 * 
 * This helper method transmits a byte passed by value and not by reference
 * 
 * \param[in]   txByte : the value of the byte to be transmitted
 * \param[in]   last   : true if last byte to be transmitted
 * \param[in]   txOnly : true no reception is to be performed
 *  
 ******************************************************************************
 */
static void st25r3916comTxByte( uint8_t txByte, bool last, bool txOnly );


/*
 ******************************************************************************
 * LOCAL FUNCTION
 ******************************************************************************
 */
static void st25r3916comStart( void )
{
    /* Make this operation atomic, disabling ST25R3916 interrupt during communications*/
    platformProtectST25RComm();
    
#ifdef RFAL_USE_I2C
    /* I2C Start and send Slave Address */
    st25r3916I2CStart();
    st25r3916I2CSlaveAddrWR( ST25R3916_I2C_ADDR );
#else
    /* Perform the chip select */
    platformSpiSelect();
    
    #if defined(ST25R_COM_SINGLETXRX)
        comBufIt = 0;                                  /* reset local buffer position   */
    #endif /* ST25R_COM_SINGLETXRX */
    
#endif /* RFAL_USE_I2C */
    
}


/*******************************************************************************/
static void st25r3916comStop( void )
{
#ifdef RFAL_USE_I2C
    /* Generate Stop signal */
    st25r3916I2CStop();
#else
    /* Release the chip select */
    platformSpiDeselect();
#endif /* RFAL_USE_I2C */
    
    /* reEnable the ST25R3916 interrupt */
    platformUnprotectST25RComm();
}


/*******************************************************************************/
#ifdef RFAL_USE_I2C
static void st25r3916comRepeatStart( void )
{
    st25r3916I2CRepeatStart();
    st25r3916I2CSlaveAddrRD( ST25R3916_I2C_ADDR );
}
#endif /* RFAL_USE_I2C */


/*******************************************************************************/
static void st25r3916comTx( const uint8_t* txBuf, uint16_t txLen, bool last, bool txOnly )
{
    RFAL_NO_WARNING(last);
    RFAL_NO_WARNING(txOnly);
    
    if( txLen > 0U )
    {
#ifdef RFAL_USE_I2C
        platformI2CTx( txBuf, txLen, last, txOnly );
#else /* RFAL_USE_I2C */
    
        #ifdef ST25R_COM_SINGLETXRX
            
            RFAL_MEMCPY( &comBuf[comBufIt], txBuf, RFAL_MIN( txLen, (uint16_t)(ST25R3916_BUF_LEN - comBufIt) ) );    /* copy tx data to local buffer                      */
            comBufIt += RFAL_MIN( txLen, (ST25R3916_BUF_LEN - comBufIt) );                                         /* store position on local buffer                    */
                
            if( last && txOnly )                                                                              /* only perform SPI transaction if no Rx will follow */
            {
                platformSpiTxRx( comBuf, NULL, comBufIt );
            }
            
        #else
            platformSpiTxRx( txBuf, NULL, txLen );
        #endif /* ST25R_COM_SINGLETXRX */
            
#endif /* RFAL_USE_I2C */
    }
}


/*******************************************************************************/
static void st25r3916comRx( uint8_t* rxBuf, uint16_t rxLen )
{
#ifndef ST25R_COM_SINGLETXRX
    uint8_t  dummyBuf;
    uint16_t rxIt;
#endif /* ST25R_COM_SINGLETXRX */
    
    if( rxLen > 0U )
    {
#ifdef RFAL_USE_I2C
        platformI2CRx( rxBuf, rxLen );
#else /* RFAL_USE_I2C */
        
    #ifdef ST25R_COM_SINGLETXRX
        RFAL_MEMSET( &comBuf[comBufIt], ST25R3916_MOSI_IDLE, RFAL_MIN( rxLen, (uint16_t)(ST25R3916_BUF_LEN - comBufIt) ) ); /* Clear outgoing buffer                       */
        platformSpiTxRx( comBuf, comBuf, RFAL_MIN( (comBufIt + rxLen), ST25R3916_BUF_LEN ) );                    /* Transceive as a single SPI call                        */
        if( rxBuf != NULL )
        {
            RFAL_MEMCPY( rxBuf, &comBuf[comBufIt], RFAL_MIN( rxLen, (uint16_t)(ST25R3916_BUF_LEN - comBufIt) ) );/* Copy from local buf to output buffer and skip cmd byte */
        }
    #else
        
        /* In case rxBuf is not provided, ensure that SPI operation is executed. *
         * Depending on the HAL used, the SPI driver may not support             *
         * NULL as Rx buffer, do single byte SPI transactions to a dummy buffer  */
        if( rxBuf == NULL )
        {
            for( rxIt = 0; (rxIt < rxLen); rxIt++ )
            {
                dummyBuf = ST25R3916_MOSI_IDLE;                                                                  /* Clear outgoing|incoming buffer                         */
                platformSpiTxRx( &dummyBuf, &dummyBuf, 1U );                                                     /* Re-use the buffer as SPI outputs data first then reads */
            }
        }
        else
        {
            RFAL_MEMSET( rxBuf, ST25R3916_MOSI_IDLE, rxLen );                                                    /* Clear outgoing|incoming buffer                         */
            platformSpiTxRx( rxBuf, rxBuf, rxLen );                                                              /* Re-use the rxBuf as SPI outputs data first then reads  */
        }
        
    #endif /* ST25R_COM_SINGLETXRX */
#endif /* RFAL_USE_I2C */
    }
}


/*******************************************************************************/
static void st25r3916comTxByte( uint8_t txByte, bool last, bool txOnly )
{
    uint8_t val = txByte;               /* MISRA 17.8: use intermediate variable */
    st25r3916comTx( &val, ST25R3916_REG_LEN, last, txOnly );
}

/*
******************************************************************************
* GLOBAL FUNCTIONS
******************************************************************************
*/

/*******************************************************************************/
ReturnCode st25r3916ReadRegister( uint8_t reg, uint8_t* val )
{
    return st25r3916ReadMultipleRegisters( reg, val, ST25R3916_REG_LEN );
}


/*******************************************************************************/
ReturnCode st25r3916ReadMultipleRegisters( uint8_t reg, uint8_t* values, uint8_t length )
{
    if( length > 0U )
    {
        st25r3916comStart();
        
        /* If is a space-B register send a direct command first */
        if( (reg & ST25R3916_SPACE_B) != 0U )
        {
            st25r3916comTxByte( ST25R3916_CMD_SPACE_B_ACCESS, false, false );
        }
        
        st25r3916comTxByte( ((reg & ~ST25R3916_SPACE_B) | ST25R3916_READ_MODE), true, false );
        st25r3916comRepeatStart();
        st25r3916comRx( values, length );
        st25r3916comStop();
    }
    
    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916WriteRegister( uint8_t reg, uint8_t val )
{
    uint8_t value = val;               /* MISRA 17.8: use intermediate variable */
    return st25r3916WriteMultipleRegisters( reg, &value, ST25R3916_REG_LEN );
}


/*******************************************************************************/
ReturnCode st25r3916WriteMultipleRegisters( uint8_t reg, const uint8_t* values, uint8_t length )
{
    if( length > 0U )
    {
        st25r3916comStart();
        
        if( (reg & ST25R3916_SPACE_B) != 0U )
        {
            st25r3916comTxByte( ST25R3916_CMD_SPACE_B_ACCESS, false, true );
        }
        
        st25r3916comTxByte( ((reg & ~ST25R3916_SPACE_B) | ST25R3916_WRITE_MODE), false, true );
        st25r3916comTx( values, length, true, true );
        st25r3916comStop();
        
        /* Send a WriteMultiReg event to LED handling */
        st25r3916ledEvtWrMultiReg( reg, values, length);
    }
    
    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916WriteFifo( const uint8_t* values, uint16_t length )
{
    if( length > ST25R3916_FIFO_DEPTH )
    {
        return RFAL_ERR_PARAM;
    }
    
    if( length > 0U )
    {
        st25r3916comStart();
        st25r3916comTxByte( ST25R3916_FIFO_LOAD, false, true );
        st25r3916comTx( values, length, true, true );
        st25r3916comStop();
    }

    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916ReadFifo( uint8_t* buf, uint16_t length )
{
    if( length > 0U )
    {
        st25r3916comStart();
        st25r3916comTxByte( ST25R3916_FIFO_READ, true, false );
        
        st25r3916comRepeatStart();
        st25r3916comRx( buf, length );
        st25r3916comStop();
    }

    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916WritePTMem( const uint8_t* values, uint16_t length )
{
    if( length > ST25R3916_PTM_LEN )
    {
        return RFAL_ERR_PARAM;
    }
    
    if( length > 0U )
    {
        st25r3916comStart();
        st25r3916comTxByte( ST25R3916_PT_A_CONFIG_LOAD, false, true );
        st25r3916comTx( values, length, true, true );
        st25r3916comStop();
    }

    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916ReadPTMem( uint8_t* values, uint16_t length )
{
    uint8_t tmp[ST25R3916_REG_LEN + ST25R3916_PTM_LEN];  /* local buffer to handle prepended byte on I2C and SPI */
    
    if( length > 0U )
    {
        if( length > ST25R3916_PTM_LEN )
        {
            return RFAL_ERR_PARAM;
        }
        
        st25r3916comStart();
        st25r3916comTxByte( ST25R3916_PT_MEM_READ, true, false );
        
        st25r3916comRepeatStart();
        st25r3916comRx( tmp, (ST25R3916_REG_LEN + length) );  /* skip prepended byte */
        st25r3916comStop();
        
        /* Copy PTMem content without prepended byte */
        RFAL_MEMCPY( values, (tmp+ST25R3916_REG_LEN), length );
    }

    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916WritePTMemF( const uint8_t* values, uint16_t length )
{
    if( length > (ST25R3916_PTM_F_LEN + ST25R3916_PTM_TSN_LEN) )
    {
        return RFAL_ERR_PARAM;
    }
    
    if( length > 0U )
    {
        st25r3916comStart();
        st25r3916comTxByte( ST25R3916_PT_F_CONFIG_LOAD, false, true );
        st25r3916comTx( values, length, true, true );
        st25r3916comStop();
    }

    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916WritePTMemTSN( const uint8_t* values, uint16_t length )
{
    if( length > ST25R3916_PTM_TSN_LEN )
    {
        return RFAL_ERR_PARAM;
    }
    
    if(length > 0U)
    {
        st25r3916comStart();
        st25r3916comTxByte( ST25R3916_PT_TSN_DATA_LOAD, false, true );
        st25r3916comTx( values, length, true, true );
        st25r3916comStop();
    }

    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916ExecuteCommand( uint8_t cmd )
{
    st25r3916comStart();
    st25r3916comTxByte( (cmd | ST25R3916_CMD_MODE ), true, true );
    st25r3916comStop();
    
    /* Send a cmd event to LED handling */
    st25r3916ledEvtCmd(cmd);
    
    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916ReadTestRegister( uint8_t reg, uint8_t* val )
{
    st25r3916comStart();
    st25r3916comTxByte( ST25R3916_CMD_TEST_ACCESS, false, false );
    st25r3916comTxByte( (reg | ST25R3916_READ_MODE), true, false );
    st25r3916comRepeatStart();
    st25r3916comRx( val, ST25R3916_REG_LEN );
    st25r3916comStop();
    
    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916WriteTestRegister( uint8_t reg, uint8_t val )
{
    uint8_t value = val;               /* MISRA 17.8: use intermediate variable */

    st25r3916comStart();
    st25r3916comTxByte( ST25R3916_CMD_TEST_ACCESS, false, true );
    st25r3916comTxByte( (reg | ST25R3916_WRITE_MODE), false, true );
    st25r3916comTx( &value, ST25R3916_REG_LEN, true, true );
    st25r3916comStop();
    
    return RFAL_ERR_NONE;
}


/*******************************************************************************/
ReturnCode st25r3916ClrRegisterBits( uint8_t reg, uint8_t clr_mask )
{
    ReturnCode ret;
    uint8_t    rdVal;
    
    /* Read current reg value */
    RFAL_EXIT_ON_ERR( ret, st25r3916ReadRegister(reg, &rdVal) );
    
    /* Only perform a Write if value to be written is different */
    if( ST25R3916_OPTIMIZE && (rdVal == (uint8_t)(rdVal & ~clr_mask)) )
    {
        return RFAL_ERR_NONE;
    }
    
    /* Write new reg value */
    return st25r3916WriteRegister(reg, (uint8_t)(rdVal & ~clr_mask) );
}


/*******************************************************************************/
ReturnCode st25r3916SetRegisterBits( uint8_t reg, uint8_t set_mask )
{
    ReturnCode ret;
    uint8_t    rdVal;
    
    /* Read current reg value */
    RFAL_EXIT_ON_ERR( ret, st25r3916ReadRegister(reg, &rdVal) );
    
    /* Only perform a Write if the value to be written is different */
    if( ST25R3916_OPTIMIZE && (rdVal == (rdVal | set_mask)) )
    {
        return RFAL_ERR_NONE;
    }
    
    /* Write new reg value */
    return st25r3916WriteRegister(reg, (rdVal | set_mask) );
}


/*******************************************************************************/
ReturnCode st25r3916ChangeRegisterBits( uint8_t reg, uint8_t valueMask, uint8_t value )
{
    return st25r3916ModifyRegister(reg, valueMask, (valueMask & value) );
}


/*******************************************************************************/
ReturnCode st25r3916ModifyRegister( uint8_t reg, uint8_t clr_mask, uint8_t set_mask )
{
    ReturnCode ret;
    uint8_t    rdVal;
    uint8_t    wrVal;
    
    /* Read current reg value */
    RFAL_EXIT_ON_ERR( ret, st25r3916ReadRegister(reg, &rdVal) );
    
    /* Compute new value */
    wrVal  = (uint8_t)(rdVal & ~clr_mask);
    wrVal |= set_mask;
    
    /* Only perform a Write if the value to be written is different */
    if( ST25R3916_OPTIMIZE && (rdVal == wrVal) )
    {
        return RFAL_ERR_NONE;
    }
    
    /* Write new reg value */
    return st25r3916WriteRegister(reg, wrVal );
}


/*******************************************************************************/
ReturnCode st25r3916ChangeTestRegisterBits( uint8_t reg, uint8_t valueMask, uint8_t value )
{
    ReturnCode ret;
    uint8_t    rdVal;
    uint8_t    wrVal;
    
    /* Read current reg value */
    RFAL_EXIT_ON_ERR( ret, st25r3916ReadTestRegister(reg, &rdVal) );
    
    /* Compute new value */
    wrVal  = (uint8_t)(rdVal & ~valueMask);
    wrVal |= (uint8_t)(value & valueMask);
    
    /* Only perform a Write if the value to be written is different */
    if( ST25R3916_OPTIMIZE && (rdVal == wrVal) )
    {
        return RFAL_ERR_NONE;
    }
    
    /* Write new reg value */
    return st25r3916WriteTestRegister(reg, wrVal );
}


/*******************************************************************************/
bool st25r3916CheckReg( uint8_t reg, uint8_t mask, uint8_t val )
{    
    uint8_t regVal;
    
    regVal = 0;
    st25r3916ReadRegister( reg, &regVal );
    
    return ( (regVal & mask) == val );
}


/*******************************************************************************/
bool st25r3916IsRegValid( uint8_t reg )
{
    if( !(( (int16_t)reg >= (int16_t)ST25R3916_REG_IO_CONF1) && (reg <= (ST25R3916_SPACE_B | ST25R3916_REG_IC_IDENTITY)) ))
    {
        return false;
    }    
    return true;
}

